+1 this as well, though it doesn't appear to be a UI issue. At least not in how it's displayed.
I was able to get around the 3 limit by simply editing the config file (since it's beautiful editable text), and the UI did show more the 4+ buttons I assigned to that action. It also synced and worked fine.
So for anyone who needs this functionality now, Notepad seems to do the trick and in my experience doesn't cause any issues.